A few years ago, I had a lease where the low end was 900' away from the road. I had a total drop of 15', but the first 400' only dropped 6". I had a 1.5" transfer line. With the times I could empty the tank and thus the TF line, I had no problem, BUT that was very rare. Most often there was sap left in the line. I ended up having frozen lines for days after a hard freeze. The woods warmed and flowed far sooner than my TF line which went thru a hemlock shaded valley on the way out to the road. I had 2 ball valves near the road, spaced by about 1' of pipe. When done pumping on any day forecast to freeze over night, I closed the uphill valve, drained the rest of the downhill pipe and valve, then I closed the downhill valve and opened the uphill valve. This protected the valves, because the only closed valve had no sap inside the ball. I fought it for 4 years, then I sold that lease (mostly because I lost my 3 good helpers when the graduated college) and told the buyer about the freezing issue. He said he would pump the sap up about 15', then on a steady slope down to the road. That may have remedied the issue. I've spoken with him many times since and he hasn't once mentioned a freeze up issue. He is also located just 1 mile from the lease and hauls in a 1200 gal tank behind a 120 HP 4x4 tractor, I was 9 miles away and hauled in 2 x 275 gal totes.
I suggest, even if you choose to use the 1" pump you have and the 1" TF line, find a way to get the line up high at the uphill tank. 10', 15 is better, then no sags from there to the outlet. Also, build a tower at the high end and have a ball valve at the high point so once the pumping is done, you can open the valve and drain the entire system. An empty pipe won't freeze!
As soon as you can see fit, increase both the pump and the TF line size. You would do well using a Honda WX15 and 1.5 or even 2" TF line.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.